Jiajun, Expanding on Jean's guideline (and perhaps the following can be used for the manual as well):
1. Ensure snappy codec works properly, following the test listed on http://hbase.apache.org/book/snappy.compression.html (On all RSes to be sure) 2. Disable the table to prepare for alteration. > disable 't' 2. Change the the CF properties to use Snappy. Use the alter command, for each of the colfams: > alter 'table', {NAME=>'f1', COMPRESSION=>'SNAPPY'}, {NAME=>'f2', > COMPRESSION=>'SNAPPY'} … 3. Re-enable the table. > enable 't' (Make sure to test the table. And do not remove away the old codec immediately. You need to wait until the whole of the table's regions have major compacted, leaving no old-codec-encoded store file traces. Correct me if am wrong there!) On Thu, May 10, 2012 at 7:26 AM, Jiajun Chen <cjjvict...@gmail.com> wrote: > How to convert snappy on existing table .used lzo compression ? > > On 10 May 2012 05:27, Doug Meil <doug.m...@explorysmedical.com> wrote: > >> >> I'll update the RefGuide with this. This is a good thing for everybody to >> know. >> >> >> >> >> >> On 5/9/12 5:08 PM, "Jean-Daniel Cryans" <jdcry...@apache.org> wrote: >> >> >Just alter the families, the old store files will get converted during >> >compaction later on. >> > >> >J-D >> > >> >On Wed, May 9, 2012 at 2:06 PM, Otis Gospodnetic >> ><otis_gospodne...@yahoo.com> wrote: >> >> Hi, >> >> >> >> Based on the example on >> >>http://hbase.apache.org/book/snappy.compression.html and some >> >>search-hadoop.com searches I'm guessing it's not possible to switch an >> >>existing HBase table to use Snappy. >> >> i.e. a new table with snappy needs to be created and old data imported >> >>into this table. >> >> >> >> Is this correct? >> >> >> >> Thanks, >> >> Otis >> >> ---- >> >> Performance Monitoring for Solr / ElasticSearch / HBase - >> >>http://sematext.com/spm >> > >> >> >> -- Harsh J
